Adam Yauch, a founding member of the Beastie Boys, died today after a long battle with cancer. As news of the 47-year-old’s untimely death spread, Yauch’s musical contemporaries and famous fans have taken to Twitter to post tributes and reactions to the news.

“R I P Adam… I’m devastated. Praying for Adam Yauch’s family from the legendary Beastie Boys. Youll be missed!” – Reverend Run

“Crushed to hear the news of Adam Yauch’s passing. A true pioneer of art. My thoughts and prayers are with his family and loved ones. #RIPMCA” - Justin Timberlake

“Rest In Peace Adam Yauch /MCA. 4ever somebody i looked up to & had the pleasure of meeting. Damn this bums me out, we lost one of the best.” - Travis Barker

“This news hits hard. The Beastie Boys are 1of the reasons I do music&MCA was the captain. Thanx for everythin MCA. Rest in Peace.” - Benji Madden

“beastie boys paved the way for so many who came after. #RIPMCA” - Pete Wentz

“Let me put it to you like this. The first record that I used to learn how to scratch was the red 7” for Sure Shot. Before I even had a mixer. There was a remix with an acapella intro that went “Like my man Yauch, will I use a fork…” and I used to cut on “fork”…just because it sounded good. My very very very first scratches, I was like 12 or something. #RIPMCA” - A-Trak

“So sad to hear of the passing of Adam Yauch. He was a great performer, director, father, humanitarian and New Yorker.” - Jimmy Fallon